Improvement in elastic attachments to rocking-chairs



H. WICI-IERT. Elastic Attachment to Rocking-Chairs.

No. 217,920. Patented July 29,1879.

NINGTON. D C,

N4 PETERS. FHOTOMTNMRAPMER. WAS

@WA4 MMM 6M if o@ UNITED STATES PATENT OEEICEg HEINRICH WICHERT, OFCHICAGO, ILLINOIS, ASSIGNOR TO JOSEPH ZAN- GERLE & CO., OF SAME PLACE.

IMPROVEMENT IN ELASTIC ATTACHMENTS TO ROCKING-CHAIRSJ Specificationforming part of Letters Patent N0. 217,920, dated July 29, 187 9application filed April 22, 1879.

Y which the rocking trame rests upon a base or supporting frame; and itis my object to provide such an attachment as will not only holdv therocker centrally upon its base, but also will yield to and facilitatethe rocking movements of the chair.

My invention consists in the peculiar construction and arrangement oftwo xtures attached relatively to the base and rocker of a` chair, andof a spiral spring in combination therewith, as more fully hereinafterwill be described.

In the drawings, Figure l represents a perspective View of a portion ofthe base and rocker for a chair with my fixtures and spring attached.Fig. 2 represents a sectional elevation, and Fig. 3 a transversevertical section of the same.

Like letters in the several figures of the drawings designate likeparts.

A represents a portion of the base-frame, and B of the rocker, of achair, both of which are constructed in the usual manner. The xture C iscomposed of a flat plate, c, which, by wood-screws, is secured againstthe inward face of the base-rail A, and is provided with arectangularly-projecting stud', b, to its lower extremity, having anotch in its end to forma hook for the lower spring end. This plate ahas a widened and upwardly-tapering extension, d, which forms a shoulderto the rocker B of the chair, for holding the same laterally in lineupon the base, and to the uppermost end of this vertical extension issecured a stud, e, rectangularly projecting, which holds a rubberthimble forforming an elastic stop, which will limit the rockingmovement of the chair toward both directions.

D is a U-shaped casting, having flanges to its ends for securing it bywood-screws against the inward face of the rocker, and a stud, f,projects off its center, which is notched in its end for receiving theupper spring end. This U-shaped piece embraces the tapering extension d'of fixture C, and has a knife-edge, g, formed to each of its inward endfaces, which are located to be exactly on the line with the lower orriding edge of the rocker, and such distance apart to closely meet thefaces ofthe tapering extension d of fixture C while the rocker is in itscentral or resting position upon the base. These knife-edges alternatelywill follow the adjoining tapering face of fixture C, and will hold therocker longitudinally central upon the base-rail.

E is a spiral spring, with hooks or loops formed to its ends, which areplaced over the studs b and f, and into the notches in theends of thesame. This spring, while rocking the chair, will be extended with eachmovement, and by its elastic resistance it will facilitate such motion.

The knife-edges g being exactly on the meeting-line of the rocker andbase, and the stud f extending from the same line, there is no tendencyfor the rocker to slip upon its base, since the spring E will retain itsvertical position during the whole extent of the rocking movement of thechair,which would not be so were said stud f in a position above theline of contact between rocker and base, while the knife-edges will soguide the rocker that it cannot be forcibly deviated from its centralposition.

The casting D striking against the rubber thimble on stud e, it willlimit the extent of the rocking movement beyond a safe degree ofextension for the spring.

This attachment, while controlling the motions of the chair andfacilitating the rocking movements of the same, will be perfectlynoiseless in its actions, .and is simple in construction and easilysecured to the rockers and base.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In combination with fixture C, secured to the base A, and havingtapering extension d, the U-shaped piece D,secured to the rocker of achainbawing knife-edges g, substantially to be constructed and arrangedfor operating ns and for the purpose set forth, substantially in themanner described, for the 2. In combination with the base A, havingpurpose specied.

fixture G, with studs b, and tapering eXten- HEINRICH WICHERT.

sions d, with stud e, the rockers of a chair Witnesses:

11a-ving' U-shaped castings D, with studs f EMIL H. FROMMANN,

und knife-edges g, and the spring E, the same ERNST J EBSEN.

